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' 0. P. GROUT,- TUBE'DRAWING TOOL.

110.355.6706. Patented Ja 4, I887.

WWW l i v gnpher. Washington. w. c

NITED STATES PATENT ()FFICE.

oHARLEs P. GROUT, or NEW YORK, N. Y.

TUBE-DRAWlNG TOOL.

SPECIFICATION forming part of Letters Patent No. 355,606, dated January 4, 188.7.

Application filed June 9, 1886. Serial No. 204,562. No model) To aZZ whOm' it may concern.-

Be it known that I, CHARLES P. GROUT, of the city and county of New York, in the State of New York, have invented a new and useful to five-eighths (more or less) in diameter, and

of a length from one-quarter to one-half an inch, or thereabout, may be readily expanded or reduced in diameter, or may be condensed or solidified by slightly reducing the thickness of the metal.

The invention consists n1 implements for the purpose above described, including a mandrel having stepped portions of diameters gradually increasing from one end to the other of the mandrel, and a plate having a corresponding series of holes of. diameters gradually increasingfrom one end to the other of the se ries, the mandrel-steps and the holes of the plate being so proportioned that any step of the mandrel and the corresponding larger hole of the plate will operate, respectively, to expand or reduce a soft-metal tube or band, and being also so proportioned that any step of the mandrel will operate with the hole corresponding to its next larger step to condense or solidify a soft-metal tube orband.

In the accompanying drawings, Figures 1 and 2 represent, respectively, the stepped mandrel and theplate provided with a series of holes which embody my invention. Fig. 3 is a side view of a short tube or band upon which the implements are intended to operate,

\ and Fig. 4 is an end view of such a tube or band.

Similar letters of reference designate corresponding parts in all the figures.

The short tubes or hands A-such as shown in Figs. 3 and 4may be made of block-tin, or

any other metal or composition which is sufficiently soft to readily change its shape and size by the application of comparatively slight pressuresuch as may be. produced with. the tools orimplements hereinafter describedand by the hands or manually.

B designates the mandrel, which is formed with stepped portions 1) Z2 b b" b I) b", of a diameter gradually increasing from one end of the mandrel toward the other.

O designates a plate which has in ita series" of holes,c c c c 0* c c, gradually increasingin diameter from one end to the other of the series.

Of course the mandrel may,have any desired number of steps varying in diameter from one to the other, as may be required for the particular purpose used, and the plate 0 may likewise have any suitable corresponding number of holes in a series increasing by as great or small graduations in diameter as may be desired.

The stepped mandrel and plate B C may be formed of metal or hard wood-such as boxwood-and I have found by practical use that wood will answer for small tubes or bands made of block-tin. Each step b", for instance, in the mandrel is made somewhat smaller than the corresponding hole, 0, in the plate 0, and such corresponding step and larger hole serve, respectively,to-expand or reduce the diameter of the tube or band A. For example, if the tube or band will slip easily over the step b, and it be desired to expand it, it may by thefingers be pushed forward onto the step b and will thereby be expanded to'a degree corresponding to the difference in diameter between the two steps b 11 If,on the other hand, a band or tube, A, is found to be somewhat larger than is desired for the purpose intended, and will slip very easily through the hole 0 for example, it may by slight pressurebe forced through the hole 0", and will thereby be reduced in diameter. Not only should'the steps of the mandrel and the holes of the plate be so proportioned that any step of the mandrel and the correspondinglarger hole of the plate'-b 0 for examplewill act, respectively, to expand and reduce the size of the tube or band, but :00 they should also be so proportioned that by the operation of one step-b", for example-in connection with the next larger hole of the platec, for examplethe tube or band may be condensed or solidifiedthat is to say, if the tube or band will slip snugly upon the step b ofthe mandrel without any expanding,it may be condensed or solidified by leaving it upon the step b and then forcing it while upon said step through the hole 0 which corresponds to the next larger step, b, of the mandrel.

Although the tools or implements above de scribed may be used for expanding, reducing; and condensing or solidifying soft-metal tubes for various purposes, I may here mention that one purpose for which such soft-metal tubes or bands may be employed is to obtain the exact size and shape of teeth preparatory to the fitting of permanent caps or crowns of gold or other metal upon them, such use of the softmetal tubes or bands being described in my United States Letters Patent No.319, 238, dated June 2, 1885.

What I claim as my invention, and desire to secure by Letters Patent, is-

Theimplements herein described for expanding, reducing, and condensing or solidifying soft-metal tubes or hands, consisting of a mandrel having stepped portions of diameters gradually increasing from one end to the other of the mandrel, and a plate having a corresponding series of holes of diameters gradually increasing from one end to the other of the series, the mandrel-steps and the holes of the plate being so proportioned that any step of the mandrel and the corresponding larger-hole of the plate will operate, respectively, to expand or reduce asoft-metal tube or band, and that any step of the mandrel will operate with the hole corresponding to its next larger step to condense or solidify a soft-metal tube or band, sub stantially as herein described.

CHAS. P. GROUT.

XVitnesses:

G. HALL, FREDK. HAYNES. 

